Add activity report
CSV Support
Add activity counts dialogue
Refactor into one sql
Add counts to table
Implement category data capture
Update cache defs
Fix date constraint
Add some extra attributes to the table
Add cell click popups to main report
Improve logic
Coalesce the mods and stu counts
Add null counts
Fix activity total counts
Sort by module total
Merge pull request #6 from unikent/master

November Updates # 2